<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <title>Hello React!</title>
    <script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>
    <script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>
    <script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script>
</head>
<body>
<div id="example"></div>
<script type="text/babel">
    var Counter = React.createClass({
        getInitialState: function(){
            return {clickCount: 0};
        },
        handleClick: function(){
            this.setState(function(state){
                return {clickCount: state.clickCount + 1};
            });
        },
        render: function(){
            return (<h2 onClick = {this.handleClick}>点我！点击次数为：{this.state.clickCount}</h2>);
        }
    });

    ReactDOM.render(
        <Counter />,
        document.getElementById('example')
    );
</script>
</body>
</html>